Abstract: Wide band LFM wave form is a kind of HRR wave form. Using stretch-processing method, high resolution range profile of the target can be obtained, and the range to a stationary target can be exactly measured. Influences to range precision and the quality of range profile by the speed of moving target are analyzed. On the bases of analyzing triangle wave form modulated LFM, the method of using DDR (Dual Channel Directional Doppler Range) technique to eliminate the influence of speed to range is presented. At the same time the two-step stretch-processing method applied to wide band LFM pulsed radar signal is suggested. By theoretical derivation and simulation, the feasibility of stretch-processing method is proved.